This was over 30 years ago.
The 3985 was the real thing. Glad UP management gave it the freedom to run.
3985, Brady, Nebraska, 5-4-1994 (58 seconds)
https://www.youtube.com/watch?v=BO5EpqQ0HUg
Pacing in Nebraska, 5-4-1994 (56 seconds)
https://www.youtube.com/watch?v=omOydYTYuEA